Identification and Characterization of Causing Leaf Spot on Kenaf.

In September 2013 and 2014, a significant number of kenaf plants showing symptoms of leaf spots with approximately 50% incidence were found in experimental plots in Iksan and Namwon, Korea. Leaf spots were circular to irregular, more or less vein-limited, reaching to 10 mm in diameter. The spots were initially uniformly brown to reddish brown, turning pale brown with a purplish margin and showing grayish patches on the lesion due to heavy fructification.

The Development of Simple Methods for the Maintenance and Quantification of .

, a root endoparasite of several cereal species, is considered to be non-pathogenic but serves as a vector of various plant viruses belonging to the genera , , and . Specifically, it reduces barley productivity by transmitting the (BaYMV). To date, due to its obligate biotrophic property, no artificial culturing of was reported and its quantification was also technically challenging.

Characterization of a Septobasidium sp. Associated with Felt Disease of Schisandra chinensis.

Extensive disease surveys performed during the summers of 2013 and 2014 in Schisandra chinensis orchards resulted in the finding of a Septobasidium sp. associated with felt disease. The fungus was characterized to be symbiotic with a scale insect (Pseudaulacaspis cockerelli).

Development of a Rapid Detection Method for Potato virus X by Reverse Transcription Loop-Mediated Isothermal Amplification.

The primary step for efficient control of viral diseases is the development of simple, rapid, and sensitive virus detection. Reverse transcription loop-mediated isothermal amplification (RT-LAMP) has been used to detect viral RNA molecules because of its simplicity and high sensitivity for a number of viruses. RT-LAMP for the detection of Potato virus X (PVX) was developed and compared with conventional reverse transcription polymerase chain reaction (RT-PCR) to demonstrate its advantages over RT-PCR.

First Report on Fusarium Wilt of Zucchini Caused by Fusarium oxysporum, in Korea.

Fusarium wilt of zucchini in Jeonju, Korea, was first noticed in May 2013. Symptoms included wilting of the foliage, drying and withering of older leaves, and stunting of plants. Infected plants eventually died during growth.

Isolation and Identification of Mushroom Pathogens from Agrocybe aegerita.

Agrocybe aegerita is an important mushroom cultivated in Korea, with good feel and a peculiar fragrance. A. aegerita can be cultivated throughout the year using culture bottles but is more susceptible to contamination than other mushrooms.

Identification and Characterization of the Causal Organism of Gummy Stem Blight in the Muskmelon (Cucumis melo L.).

Gummy stem blight is a major foliar disease of muskmelon (Cucumis melo L.). In this study, morphological characteristics and rDNA internal transcribed spacer (ITS) sequences were analyzed to identify the causal organism of this disease.

Molecular analysis of Korean isolate of barley yellow mosaic virus.

The complete sequences of both RNAs of an isolate of barley yellow mosaic virus (BaYMV) from Haenam, Korea, were determined. RNA1 is 7639 nucleotides long [excluding the 3'-poly(A)], and codes for a 270 kDa polyprotein of 2411 amino acids which contains the capsid protein (CP) at the C terminus and seven putative non-structural proteins. RNA2 is 3582 nucleotides long and codes for a polyprotein of 890 amino acids, which contains a 28 kDa putative proteinase (P1) and a 73 kDa polypeptide (P2).

Growth of Brassica juncea under chromium stress: influence of siderophores and indole 3 acetic acid producing rhizosphere bacteria.

Plant growth promoting rhizobacterial (PGPR) strains A3 and S32 have been shown to promote the growth of Brassica juncea under chromium stress which has been related to the microbial production of siderophores and indole 3 acetic acid (IAA). The aim of the present study is to evaluate the importance of siderophores and IAA producing PGPR on the growth of Brassica juncea under chromium stress. The production of IAA and siderophores were observed in the strains A3 and S32, respectively.

Influence of plant growth promoting bacteria and Cr6+ on the growth of Indian mustard.

The Cr(6+) resistant plant growth promoting bacteria (PGPB), Pseudomonas sp. PsA4 and Bacillus sp. Ba32 were isolated from heavy metal contaminated soils and their plant growth promoting activity on the Indian mustard (Brassica juncea) were assessed with different concentrations of Cr(6+) in soil.

Characterization of a novel Cr6+ reducing Pseudomonas sp. with plant growth-promoting potential.

The isolate RNP4 obtained from a long-term tannery waste contaminated soil was characterized and presumptively identified as Pseudomonas sp. The strain RNP4 tolerated concentrations up to 450 mg Cr(6+)/L on a Luria-Bartani (LB) agar medium and reduced a substantial amount of Cr(6+) to Cr(3+) in the LB liquid medium. The ability of performing multifarious activities in tandem suggested the uniqueness of isolate RNP4.

Screening of bacterial antagonists for biological control of Phytophthora blight of pepper.

The aim of this study was to assess the potential of bacterial antagonists to control Phytophthora blight of pepper caused by P. capsici using different screening methods. Among a collection of fluorescent pseudomonas isolated from the rhizosphere of pepper, twelve isolates were initially selected based on dual culture assay on potato dextrose agar and corn meal agar.

Growth responses of Cassia obtusifolia toward human intestinal bacteria.

1,2-Dihydroxyanthraquinone (1) was isolated from the seed of Cassia obtusifolia through bioassay-guided fractionation. 1,2-Dihydroxyanthraquinone strongly inhibited the growth of Clostridium perfringens and Escherichia coli. Structure-activity relationship revealed that 1,4-dihydroxyanthraquinone (2) and 1,8-dihydroxyanthraquinone (3) had strong growth-inhibition against C.